Let's face it: an engine that was in front-line service for 50 years, with more than ninety…
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The first Chrysler Flathead Six, a 68-horsepower engine displacing 201 cubic inches, appeared in 1924, and it was still being installed in Dodge Power Wagons and military M37 trucks as late as 1968 (the last of the Flathead Six-powered Chrysler cars rolled off the assembly line in 1959). After that, Chrysler kept making the engine for industrial and farm use well into the 1970s. 50 years, or just close to it? We'll need input from you serious vintage Mopar experts to know for sure!
[Wikipedia, Allpar]